问题 问答题 案例分析题

背景

某工地-10m×6.5m的焊接车间内,一端作为材料存放场地,氧气瓶、乙炔瓶、二氧化碳气瓶整齐顺墙根摆放一起;另一端两名工人正在进行电焊作业,另一名工人在门口吸烟。由于天气炎热,三人只穿了衬衫作业。

由于电焊机故障,焊机整体带电,正在施焊的两名工人触电,而开关箱中装设的漏电保护器失灵,吸烟的工人迅速打开总配电箱,发现未设置初级漏电保护器。于是切断总开关,导致整个工地停电。触电工人经抢救脱离危险,二人均造成重伤。经查,此三人中只有抽烟的工人有“特种作业操作证”。

对总配电箱和开关箱中漏电器的配置有何具体要求?

答案

参考答案:

在总配电箱(配电柜)中作为初级保护的漏电保护器,其额定漏电动作电流必须要大于30mA,额定漏电动作时间也必须要大于0.1s,但其额定漏电动作电流与额定漏电动作时间的乘积最高应限制在30mA·s以内。

在开关箱中作为末级保护的漏电保护器,其额定漏电动作电流不应大于30mA,额定漏电动作时间不应大于0.1s;在潮湿、有腐蚀性介质的场所中,开关箱中的漏电保护器要选用防溅型的产品,其额定漏电动作电流不应大于15mA,额定漏电动作时间不应大于0.1s。

单项选择题
单项选择题

When there is blood in the water, it is only natural that dorsal fins swirl around excitedly. Now that America’s housing market is ailing, predators have their sights on the country’s credit-card market. Analysts at Goldman Sachs reckon that credit-card losses could reach $ 99 billion if contagion spreads from subprime mortgages to other forms of consumer credit. Signs of strain are clearly visible. There are rises in both the charge-off and delinquency rates, which measure the share of balances that are uncollectable or more than 30 days late respectively. HSBC announced last month that it had taken a $1.4 billion charge in its American consumer-finance business, partly because of weakness among card borrowers.

It is too early to panic, though. Charge-offs and delinquencies are still low. According to Moody’s, a rating agency, the third-quarter delinquency rate of 3.89% was almost a full percentage point below the historical average. The deterioration in rates can be partly explained by technical factors. A change in America’s personal-bankruptcy laws in 2005 led to an abrupt fall in bankruptcy filings, which in turn account for a big chunk of credit-card losses ; the number of filings (and thus charge-off rates) would be rising again, whether or not overall conditions for borrowers were getting worse.

The industry also reports solid payment rates, which show how much of their debt consumers pay off each month. And confidence in credit-card asset-backed securities is pretty firm despite paralysis in other corners of structured finance. Dennis Moroney of Tower Group, a research firm, predicts that issuance volumes for 2007 will end up being 25% higher than last year.

Direct channels of infection between the subprime-mortgage crisis and the credit-card market certainly exist: consumers are likelier to load up on credit-card debt now that home- equity loans are drying up. But card issuers look at cash flow rather than asset values, so falling house prices do not necessarily trigger a change in borrowers’ creditworthiness. They may even work to issuers’ advantage. The incentives for consumers to keep paying the mortgage decrease if properties are worth less than the value of the loan; card debt rises higher up the list of repayment priorities as a result.

Card issuers are also able to respond much more swiftly and flexibly to stormier conditions than mortgage lenders are, by changing interest rates or altering credit limits. That should in theory reduce the risk of a rapid repricing of assets. "We are not going to wake up one day and totally revalue the loans," says Gary Perlin, Capital One’ s chief financial officer.

If a sudden subprime-style meltdown in the credit-card market is improbable, the risks of a sustained downturn are much more real. If lower house prices and a contraction in credit push America into recession, the industry will undoubtedly face a grimmer future. Keep watching for those dorsal fins.

In what way does the subprime mortgage influence credit card market()

A. The fall of asset values affects the card borrowers’ creditworthiness

B. The decrease in the mortgage payment leads to the rises of the card debt

C. As the home-equity loans are drying up, consumers are more likely to load up on the card debt

D. The falling house prices make the card debt rise higher